Respostas

  • Usuário do Brainly
2013-06-19T17:32:13-03:00

Temos que:

 

-5\text{x}^2+60=0

 

5\text{x}^2=60

 

\text{x}^2=\dfrac{60}{5}

 

\text{x}^2=12

 

\text{x}=\pm\sqrt{12}

 

\text{x}=\pm2\sqrt{3}

 

Logo, \text{S}=\{-2\sqrt{3}, 2\sqrt{3}\}.

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